Apparatus and method for transferring garment draping between avatars
Provided are an apparatus and method for transferring garment draping between avatars. A virtual reference garment, which is modeled with meshes whose plurality of vertices are connected to each other by springs and is designed to closely adhere to a body surface, is prepared. The virtual reference garment is draped on a source avatar. The same virtual reference garment is also draped on a target avatar. As a correspondence map between the avatars, pairs of pieces of position information of meshes of the virtual reference garment draped on the source avatar and corresponding meshes of the virtual reference garment draped on the target avatar are calculated. According to another aspect, deformation transformations between the meshes of the virtual reference garment draped on the source avatar and the corresponding meshes of the virtual reference garment draped on the target avatar are calculated and stored as deformation transformations between the avatars.
1. A method of transferring garment draping between avatars, the method comprising:
preparing a virtual reference garment modeled with meshes having a plurality of vertices connected to each other;
draping the virtual reference garment on a source avatar with meshes of the virtual reference garment adhered to surfaces of the source avatar;
draping the virtual reference garment on a target avatar with the meshes of the virtual reference garment adhered to surfaces of the target avatar;
obtaining a correspondence map indicating correspondence relationships between the meshes of the virtual reference garment draped on the source avatar and the corresponding meshes of the virtual reference garment draped on the target avatar;
determining avatar deformation as deformation transformations between the meshes of the virtual reference garment draped on the source avatar and the corresponding meshes of the virtual reference garment draped on the target avatar as defined by the correspondence map; and
transfer-and-draping a target garment draped on the source avatar, the target garment being distinct from the virtual reference garment, onto the target avatar based on the avatar deformation.
2. The method of claim 1 , wherein the transfer-and-draping of the target garment comprises:
performing an affine transformation operation of disposing the meshes of the target garment draped on the source avatar to corresponding positions of the target avatar according to the correspondence map and applying the avatar deformation to each of the meshes of the target garment.
3. The method of claim 1 , wherein the avatar deformation comprises deformation information which corresponds barycenter coordinates of the meshes of the virtual reference garment draped on the source avatar with barycenter coordinates of corresponding meshes of the virtual reference garment draped on the target avatar.
4. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to:
prepare a virtual reference garment modeled with meshes having a plurality of vertices connected to each other;
drape the virtual reference garment on a source avatar with meshes of the virtual reference garment adhered to surfaces of the source avatar;
drape the virtual reference garment on a target avatar with the meshes of the virtual reference garment adhered to surfaces of the target avatar;
obtain a correspondence map indicating correspondence relationships between the meshes of the virtual reference garment draped on the source avatar and the corresponding meshes of the virtual reference garment draped on the target avatar;
determine avatar deformation as deformation transformations between the meshes of the virtual reference garment draped on the source avatar and the corresponding meshes of the virtual reference garment draped on the target avatar as defined by the correspondence map; and
transfer-and-drape a target garment draped on the source avatar, the target garment being distinct from the virtual reference garment, onto the target avatar based on the avatar deformation.
5. An apparatus for transferring garment draping between avatars, the apparatus being implemented as a computing device including a microprocessor and a memory for storing a program executed by the microprocessor and data, wherein the program includes:
a correspondence map command set configured to:
prepare a virtual reference garment modeled with meshes having a plurality of vertices connected to each other,
drape the virtual reference garment on a source avatar with meshes of the virtual reference garment adhered to surfaces of the source avatar,
drape the virtual reference garment on a target avatar with the meshes of the virtual reference garment adhered to surfaces of the target avatar, and
obtain a correspondence map indicating correspondence relationships between the meshes of the virtual reference garment draped on the source avatar and the corresponding meshes of the virtual reference garment draped on the target avatar;
an avatar deformation calculation command set configured to determine avatar deformation as deformation transformations between the meshes of the virtual reference garment draped on the source avatar and the corresponding meshes of the virtual reference garment draped on the target avatar as defined by the correspondence map; and
a garment draping transfer command set configured to perform transfer-and-draping a target garment draped on the source avatar, the target garment being distinct from the virtual reference garment, onto the target avatar based on the avatar deformation.
6. The apparatus of claim 5 , wherein the garment draping transfer command set comprises:
an affine transformation command set for disposing the meshes of the target garment draped on the source avatar to corresponding positions of the target avatar according to the correspondence map and applying the avatar deformation to each of the meshes of the target garment.
7. The apparatus of claim 5 , wherein the avatar deformation comprises deformation information which corresponds barycenter coordinates of the meshes of the virtual reference garment draped on the source avatar with barycenter coordinates of corresponding meshes of the virtual reference garment draped on the target avatar.